Michael LohanYOU ARE THE FATHER!!!DNA Confirms Teen Lovechild

11/15/2012 5:30 AM PST BY TMZ STAFF

THE DNA TEST IS IN -- Michael Lohan fathered an illegitimate lovechild back in 1995 behind Dina Lohan's back ... and Michael's reaction to the shocking paternity reveal was all caught on tape.

Michael agreed to submit to a DNA test for an episode of "Trisha Goddard" -- where he comes face-to-face for the first time with the 17-year-old girl who claimed to be his daughter -- and the results came back POSITIVE.

The girl's mother -- Kristi Horn -- has claimed Michael was the father for years, and has even tried multiple times to get him to pay child support ... but Michael adamantly denied the allegations.